MARINE CORPS BASE QUANTICO, Va. --The Marine Corps is adopting a new precision sniper rifle to increase the lethality and combat effectiveness of scout snipers on the battlefield.

The Mk13 Mod 7 Sniper Rifle is a bolt-action rifle that offers an increased range of fire and accuracy when compared to current and legacy systems. It includes a long-action receiver, stainless steel barrel, and an extended rail interface system for a mounted scope and night vision optic.

The Mk13 is scheduled for fielding in late 2018 and throughout 2019. Units receiving the Mk13 include infantry and reconnaissance battalions and scout sniper schoolhouses. This weapon is already the primary sniper rifle used by Marine Corps Forces Special Operations Command, or MARSOC.

Fielding the Mk13 ensures the Corps has commonality in its equipment set and Marine scout snipers have the same level of capability as North Atlantic Treaty Organization forces, said Master Sgt. Shawn Hughes from III MEF.

“When the Mk13 Mod 7 is fielded, it will be the primary sniper rifle in the Marine Corps,” said Lt. Col. Paul Gillikin, Infantry Weapons team lead at Marine Corps Systems Command. “The M40A6 will remain in the schoolhouses and operating forces as an alternate sniper rifle primarily used for training. The M110 and M107 will also remain as additional weapons within the scout sniper equipment set.”

The Marine Corps identified a materiel capability gap in the maximum effective ranges of its current sniper rifles. After a comparative assessment was conducted, it was clear that the Mk13 dramatically improved scout sniper capabilities in terms of range and terminal effects. The 3rd Battalion, 5th Marines Scout Sniper Platoon used the weapon for over a year (including during a deployment) in support of the 2025 Sea Dragon Exercise. Feedback from MCSC’s assessment, MARSOC’s operational use, and 3/5’s testing of the weapon system led to its procurement of the Mk13 for the Corps.

The Mk13 increases scout snipers’ range by roughly 300 meters and will use the .300 Winchester Magnum caliber round, a heavier grain projectile with faster muzzle velocity—characteristics that align Marine sniper capability with the U.S. Army and Special Operations Command.

"The .300 Winchester Magnum round will perform better than the current 7.62 NATO ammo in flight, increasing the Marine Sniper's first round probability of hit,” said Chief Warrant Officer 3 Tony Palzkill, Battalion Gunner for Infantry Training Battalion. “This upgrade is an incredible win and will allow snipers to engage targets at greater distances."

The Mk13 will also be fielded with an enhanced day optic that provides greater magnification range and an improved reticle.

“The new day optic allows for positive identification of enemies at greater distances, and it has a grid-style reticle that allows for rapid reengagement without having to dial adjustments or ‘hold’ without a reference point,” he said. “With this type of weapon in the fleet, we will increase our lethality and be able to conceal our location because we are creating a buffer between us and the enemy.”

MCSC completed New Equipment Training for the Mk13 with a cross section of Marines from active-duty, Reserve and training units in early April.

“The snipers seemed to really appreciate the new capabilities that come with this rifle and optic,” said project officer Capt. Frank Coppola. “After the first day on the range, they were sold.”

In a time where technology, ammunition and small arms weapon systems are advancing at an increasingly rapid rate, it is extremely important to ensure the Marine Corps is at the forefront of procuring and fielding new and improved weapon systems to the operating forces, said Gillikin.

“Doing this enables the Corps to maintain the advantage over its enemies on the battlefield, as well as to secure its trusted position as the rapid crisis response force for the United States,” he said.

Russian infantry weapons have a reputation for reliability. The AK and PKM are renowned for enduring through adverse conditions, powered by their powerful long-stroke piston actions. However, a recent report by warhead.su suggests that when these weapons do fail in Russian service, the problem is often not in their design, but rather in the Russian ammunition they fire. This is not a new phenomenon. Russian imported ammunition to the United States has always been regarded as “budget” brands, with inconsistent quality. But apparently, the same problems apply to Russian military ammunition.

The report opens with a story of a soldier operating a Kord 12.7mm (.50 cal) heavy machine gun. The soldier noticed the belt was a little lighter than usual, and when he pulled the trigger… the bullet got stuck in the barrel, not even passing the gas port on the barrel. The cause for this is the inconsistencies in Russian powder manufacture. In addition to bullets getting stuck in the barrel (squib), there are stories of guns shooting hotter than usual, and guns exploding due to too much powder being in a cartridge. Of course, for these reasons, Russian domestic ammunition is rarely the ammo of choice for Russian precision shooters.

The occurrence of these squibs poses a significant reliability problem for all weapons, as they can cause the barrel to explode if the soldier does not realize a squib has been fired and attempts another shot. Given the Russian predilection for automatic modes of fire, this only compounds the problem as a soldier would likely not have time to react before the second round is fired.

Moving from powder problems, the report goes on to talk about primer problems. The primer is the small explosive component in the rear of the cartridge that detonates when the firing pin strikes it, setting off the rest of the gunpowder in a cartridge. It usually is placed in the “primer pocket” in the rear of a cartridge and then sealed with varnish to keep them in place. Russian cartridges also have significant difficulty with this. The primers are inserted in backward or sideways and are sometimes missing the primer itself.

But those are the least of the primer flaws, being readily visible. Usually soldiers inspect their ammunition as they are loading them into their magazines, and such defects are readily spotted and thrown away. What’s worse is the harder to spot flaws of a protruding primer or defects in the workmanship of the primer itself. Protruding primers pose great danger to soldiers, as the primer can get struck in the magazine, resulting in detonation. This has happened with some Russian ammunition, a picture was provided of a 9x18 Makarov round in a magazine that did this. Russian primers have also proven to prove vulnerable to being punctured, which results in the hot gases of the powder detonating rushing back through the punctured primer onto the bolt face, which can significantly damage the firearm. They also have been known to fall out during the extraction cycle, falling into the fire control group of a firearm. This can potentially cause misfires, or lock up a gun.

Other problems include inconsistent depth of insertion of the bullet. This may cause some of the overpressure problems, but it definitely does not help the consistency of Russian ammunition. There were also issues with some cartridges being totally out of specification—being too long, for example. When combined with an open bolt gun like the Shpagin submachine gun, the results are catastrophic. Because of the fixed firing pin on the bolt of the gun, the cartridge detonated before the bolt was fully locked, destroying the firearm.

These problems are not only reported on that site. Various videos from Spetsnaz veterans discuss ammunition problems that plagued their service weapons. One of them singles out the special armor piercing 7N21 and 7N31 9x19mm ammo of being particularly low quality and causing significant reliability problems in the issued PYa pistol. Indeed, the photo of a bullet sticking out of the barrel linked above is a 7N21 round, as seen by the black stepped tip. Other sites have suggested that the PYa only chokes on ammo from certain factories, but this itself can be a seen as representative as an overall lack of ammunition standards in the supply of ammunition to the Russian police and military. As one infantry veteran lamented: “The Russian arms industry makes reliable and simple weapons, but ammo quality just annihilates it.”

Charlie Gao studied political and computer science at Grinnell College and is a frequent commentator on defense and national-security issues.